CN113189421A - Electromagnetic valve detection device and detection method based on electromagnetic drive validity detection - Google Patents
Electromagnetic valve detection device and detection method based on electromagnetic drive validity detection Download PDFInfo
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Abstract
本发明公开一种基于电磁驱动有效性检测的电磁阀检测装置，包括检测控制板，检测控制板上设置有显示接口、通讯接口、多个电磁阀电源选择接口、多个电磁阀电磁驱动接口、多个电磁阀检测选择接口、工作/检测切换接口、校准/检测切换接口、系统电源接口，每个接口上对应连接有对应的模块或开关，本发明提供的基于电磁驱动有效性检测的电磁阀检测装置，基于电磁线圈的固有电气特性，从伏安特性和阶跃方程求解切入，解开了电磁阀检测的基本原理，为电磁阀有效性检测提供了检测手段，保证了正常的生产工作状态。
The invention discloses a solenoid valve detection device based on electromagnetic drive effectiveness detection, comprising a detection control board, and the detection control board is provided with a display interface, a communication interface, a plurality of solenoid valve power selection interfaces, a plurality of solenoid valve electromagnetic drive interfaces, A plurality of solenoid valve detection selection interfaces, work/detection switching interfaces, calibration/detection switching interfaces, and system power supply interfaces, each of which is correspondingly connected with a corresponding module or switch, the present invention provides a solenoid valve based on electromagnetic drive effectiveness detection The detection device, based on the inherent electrical characteristics of the electromagnetic coil, starts from the volt-ampere characteristics and the step equation solution, solves the basic principle of the solenoid valve detection, provides a detection method for the effectiveness detection of the solenoid valve, and ensures the normal production working state .
Description
Technical Field
The invention belongs to the technical field of electromagnetic valves, and particularly relates to an electromagnetic valve detection device and method based on electromagnetic drive validity detection.
Background
The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid, belongs to an actuator, and is not limited to hydraulic pressure and pneumatic pressure. Used in industrial control systems to regulate the direction, flow, velocity and other parameters of a medium. The solenoid valve can be matched with different circuits to realize expected control, and the control precision and flexibility can be ensured. There are many types of solenoid valves, with different solenoid valves functioning at different locations in the control system, the most common being one-way valves, safety valves, directional control valves, speed control valves, etc.
With the economic development of China, the manufacturing technology and the industrial technology of China are rapidly developed, and the electromagnetic valve is a device which has a simple structure and is indispensable and can not be opened in the development of the manufacturing industry and the industry. In actual production, some solenoid valves frequently work for a long time, and some solenoid valves have lower working frequency, so that the linkage function of the solenoid valves is realized for a large tank area. However, at present, the effectiveness detection of the electromagnetic valve is always an overlooked link, or depends on manual confirmation of the working characteristics of the electromagnetic valve to judge whether the electromagnetic valve is in an effective working state, and an effective detection means is lacked to determine whether the electromagnetic valve is in the effective working state.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an electromagnetic valve detection device and a detection method based on electromagnetic drive validity detection, solving cut-in from volt-ampere characteristics and a step equation based on the inherent electrical characteristics of an electromagnetic coil, solving the basic principle of electromagnetic valve detection, providing a detection means for the electromagnetic valve validity detection and ensuring the normal production working state.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electromagnetic valve detection device based on electromagnetic drive validity detection comprises: a detection control panel, which is provided with a display interface, a communication interface, a plurality of solenoid valve power supply selection interfaces, a plurality of solenoid valve electromagnetic driving interfaces, a plurality of solenoid valve detection selection interfaces, a work/detection switching interface, a calibration/detection switching interface and a system power supply interface, wherein the display interface is connected with a display module, the communication interface is connected with a communication host, the plurality of solenoid valve power supply selection interfaces are connected with a work/detection universal switch, each solenoid valve electromagnetic driving interface is connected with a corresponding solenoid valve electromagnetic driving device, the work/detection universal switch is a universal conversion control switch for providing working power supply for each solenoid valve electromagnetic driving device, each solenoid valve detection selection interface is connected with a corresponding solenoid valve detection selection switch, the system power supply interface is connected with a system power supply, and the work/detection switching interface is connected with a work/detection switching switch, the calibration/detection switching interface is connected with a calibration/detection switching switch.
Further, the system power supply is a 380V power supply, the work/detection switch is a 24V direct-current power supply switch, the calibration/detection switch is a 24V direct-current power supply switch, each electromagnetic valve detection selection switch is a 24V direct-current power supply point-type button switch, the detection control panel further comprises a power indicator lamp interface, the system power supply interface is connected to the internal power indicator lamp interface, and the power indicator lamp interface is connected with a power indicator lamp.
Furthermore, the detection device also comprises an AC/DC module, a DC/DC module, a CPU, an AD sampling module, a constant current source, a standard resistor, an optical coupler and a decoupling diode group, wherein the AC/DC module is connected with a system power interface and used for converting alternating current provided by a system power supply into direct current, the AC/DC module provides electric energy for the constant current source and the DC/DC module through a normally open contact of the work/detection change-over switch, the DC/DC module provides electric energy for the CPU, and the constant current source provides standard current for the standard resistor.
Furthermore, a common contact of the calibration/detection change-over switch is connected to an input interface of the AD sampling module, a normally closed contact of the calibration/detection change-over switch is connected to two ends of the standard resistor, a normally open contact of the calibration/detection change-over switch is connected to a common contact of the working/detection universal switch, the normally closed contact of the working/detection universal switch is connected to the decoupling secondary tube group, the normally open contacts of the working/detection universal switch are connected to normally open contacts of the electromagnetic valve detection selection switches, the electromagnetic valve power supply selection interfaces are respectively connected to normally closed contacts of the electromagnetic valve detection selection switches, and the common contacts of the electromagnetic valve detection selection switches are respectively connected to the corresponding electromagnetic driving interfaces of the electromagnetic valves.
Further, coil control signals of the plurality of electromagnetic valve detection selection switches are connected to the plurality of corresponding electromagnetic valve detection selection interfaces, coil control signals of the calibration/detection changeover switch are connected to the calibration/detection changeover interface, coil control signals of the working/detection changeover switch are connected to the working/detection changeover slit, the electromagnetic valve detection selection interface, the calibration/detection changeover interface and the working/detection changeover slit are connected to the CPU, and coil control signals of the working/detection universal switch are connected to the CPU.
Furthermore, the standard resistor is a precision power resistor, and the decoupling diode and the diodes connected in parallel on the plurality of electromagnetic valve detection selection switches, the working/detection change-over switches, the calibration/detection change-over switches and the working/detection universal switches are all rectifier diodes with follow current functions.
The invention also discloses an electromagnetic valve detection method based on electromagnetic drive validity detection, which comprises the following steps:
s1: powering on the detection device to enable the detection device to be in a working state;
s2: calibrating the detection device to ensure that the detection device meets the detection requirement;
s3: and detecting the electromagnetic valves one by using a detection device, and judging the electromagnetic driving effectiveness of the electromagnetic valves.
Further, step S1 is to switch the operation/detection switch to a detection state, connect the detection control board to the system power supply, and initialize the detection control board, where the operation/detection switch is in an attraction state, and the plurality of solenoid valve detection selection switches, the calibration/detection switch, and the operation/detection multi-turn switch are all in a release state.
Further, step S2 is specifically:
s2.1, calculating a designed theoretical voltage signal according to a constant current value and a standard resistance value set by a constant current source:
VS＝IH×R
in the formula: vSTo design a theoretical voltage, IHConstancy set for constant current sourceThe current value R is a standard resistance value;
s2.2.AD sampling module acquires actual voltage signal VY；
S2.3, calculating the calibration accuracy rate eta,
and displaying the calibration result on a display module;
and S2.4, judging whether the calibration accuracy rate eta meets the test requirement, if the calibration accuracy rate eta cannot meet the test requirement, positively determining the sampling system until the calibration accuracy rate eta can meet the test requirement.
Further, step S3 is specifically:
s3.1, switching a calibration/detection switch to a detection state, wherein the calibration/detection switch is in an attraction state, a constant current source is loaded on a sampling signal line and connected to a common end of a contact of a work/detection switch, and a sampling signal is connected to a common contact of the work/detection universal switch through the calibration/detection switch;
s3.2, pressing one of the electromagnetic valve detection selection switches, sending a control signal by the CPU, driving the working/detection universal switch to suck through the optical coupler, opening a sampling channel, and connecting the sampling channel to a normally closed contact of the pressed electromagnetic valve detection selection switch;
s3.3, because the detection object is an electromagnetically-driven coil and has an inductive property, the detection project is divided into three stages according to the step response characteristic of the inductor, namely a charging stage, a holding stage and a discharging stage, wherein the charging stage and the discharging stage have certain duration, the charging stage and the discharging stage are avoided during detection, the detection is carried out in the holding stage, the inductive effect disappears, only the resistance effect of the coil is kept, and the resistance effect of the coil corresponds to the actual equivalent resistance value of the coil;
s3.4, according to the inherent resistance of the coil and the constant current value set by the constant current source, a designed theoretical voltage signal can be calculated according to the step S2.1; the AD sampling module collects the actual voltage signal VY(ii) a The effective rate eta of the electromagnetic drive is calculated,
the calculation result is displayed on a display module, when eta is not less than a certain set value, the corresponding electromagnetic driving device is considered to be in a normal state, and when eta is less than a certain set value, the coil parameter of the corresponding electromagnetic driving device is considered to have a larger difference with the design value or the corresponding electromagnetic driving device has a fault;
s3.5, according to the steps from S3.2 to S3.4, one of the electromagnetic valve detection selection switches is pressed one by one, corresponding electromagnetic valves are selected to be detected respectively, and calculation results are displayed on a display module;
and S3.6, after all the electromagnetic valves are detected, switching the working/universal switch to a working state, and switching the working/detection switch to the working state to complete the detection of all the electromagnetic valves.
Compared with the prior art, the electromagnetic valve detection device and the detection method based on electromagnetic drive validity detection have the following beneficial effects:
the invention provides an electromagnetic valve detection device based on electromagnetic driving validity detection, which comprises a detection control panel, wherein a work/detection switching interface is arranged on the detection control panel, a work/detection switching switch is connected onto the work/detection switching interface, when the work/detection switching switch is in a working state, the detection control panel is disconnected from a system power supply interface, the detection control panel is in a bypass state, the electromagnetic valve is in a normal working state, and the working performance is not influenced by the detection control panel. When the electromagnetic valve is required to be detected, the work/detection change-over switch is switched to a detection state, at the moment, the detection control panel is connected with the system power supply, the detection control panel is electrified to initialize the detection control panel, and the detection device is in an enabling state.
The electromagnetic valve detection device based on electromagnetic drive validity detection is characterized in that a calibration/detection switching interface is arranged on a detection control board, a calibration/detection switching switch is connected to the calibration/detection switching interface, a constant current source, a standard resistor and an AD sampling module are arranged on the detection control board, and the electromagnetic valve detection device is calibrated by calculating a theoretical voltage signal, acquiring an actual voltage signal, and comparing the actual voltage signal with the theoretical voltage signal based on a volt-ampere characteristic principle, so that the electromagnetic valve detection device is ensured to be in a normal state and can be used for detecting an electromagnetic valve.
The invention provides an electromagnetic valve detection device based on electromagnetic driving validity detection, which comprises a plurality of electromagnetic valve power supply selection interfaces, wherein a work/detection universal switch is connected to the plurality of electromagnetic valve power supply selection interfaces, the work/detection universal switch is a universal conversion control switch for providing a work power supply for each electromagnetic valve electromagnetic driving device, a plurality of electromagnetic valve detection selection interfaces are further arranged on a detection control panel, and each electromagnetic valve detection selection interface is connected with a corresponding electromagnetic valve detection selection switch. The arrangement of the plurality of solenoid valve power supply selection interfaces and the plurality of solenoid valve detection selection interfaces facilitates the expansion of the number of the solenoid valves which can be detected by the detection device, and the number of the solenoid valve power supply selection interfaces and the solenoid valve detection selection interfaces in the detection device can be configured according to actual conditions.
The electromagnetic valve detection device based on electromagnetic driving validity detection utilizes the step response characteristic of the inductor. Because the essence of the electromagnetic valve driving effectiveness detection is also the detection of an electromagnetic driving coil, the coil has an inductance characteristic, and the detection process is divided into three stages based on the step response characteristic of the inductance: charging stage, holding stage and discharging stage. The charging stage and the discharging stage have a certain duration, the inductance effect disappears in the keeping stage, only the resistance effect of the coil is kept, and the electromagnetic driving effectiveness of the electromagnetic valve can be judged by calculating a voltage design value, acquiring a voltage actual value by the AD sampling module, comparing the deviation between the voltage design value and the voltage actual value acquired by the AD sampling module.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a control system diagram of an electromagnetic valve detection device based on electromagnetic driving validity detection provided by the invention;
fig. 2 is a system schematic diagram of the electromagnetic valve detection device based on electromagnetic driving validity detection provided by the invention.
In the figure, 1, a detection control board, 2, a display interface, 3, a communication interface, 4, a solenoid valve power supply selection interface, 5, a solenoid valve electromagnetic driving interface, 6, a solenoid valve detection selection interface, 7, a work/detection switching interface, 8, a calibration/detection switching interface, 9, a system power supply interface, 10, a display module, 11, a communication host, 12, a work/detection universal switch, 13, a solenoid valve electromagnetic driving device, 14, a solenoid valve detection selection switch, 15, a system power supply, 16, a work/detection switching switch, 17, a calibration/detection switching switch, 18, a power indicator interface, 19, a power indicator, 20, an AC/DC module, 21, a DC/DC module, 22, a CPU, 23, an AD sampling module, 24, a constant current source, 25, a standard resistor, 26, an optical coupler, 27, a decoupling diode group.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, fig. 1 is a control system diagram of an electromagnetic valve detection apparatus based on electromagnetic driving validity detection according to the present invention; fig. 2 is a system schematic diagram of the electromagnetic valve detection device based on electromagnetic driving validity detection provided by the invention.
The invention provides an electromagnetic valve detection device based on electromagnetic driving validity detection, which comprises: the detection control panel 1 is provided with a display interface 2, a communication interface 3, 4 electromagnetic valve power supply selection interfaces 4, 4 electromagnetic valve electromagnetic driving interfaces 5, 4 electromagnetic valve detection selection interfaces 6, a work/detection switching interface 7, a calibration/detection switching interface 8 and a system power supply interface 9 on the detection control panel 1.
The display module 10 is connected to the display interface 2, the display module 10 adopts a 12864 type liquid crystal display screen, and a data control interface of the liquid crystal display screen is connected to the display interface 2 of the detection control panel 1; the communication interface 3 is connected with a communication host 11, the communication host 11 adopts host equipment for serial communication, and the communication interface 3 of the host is connected to the communication interface 3 of the detection control panel 1; the 4 solenoid valve power supply selection interfaces 4 are connected with work/detection universal switches 12, each solenoid valve electromagnetic driving interface 5 is connected with a corresponding solenoid valve electromagnetic driving device 13, and the work/detection universal switches 12 are universal conversion control switches for providing work power supplies for the solenoid valve electromagnetic driving devices 13. Each solenoid valve detection selection interface 6 is connected with a corresponding solenoid valve detection selection switch 14, the system power supply interface 9 is connected with the system power supply 15, the work/detection switching interface 7 is connected with the work/detection switching switch 16, and the calibration/detection switching interface 8 is connected with the calibration/detection switching switch 17.
The system power supply 15 is a 380V power supply, the working/detection switch 16 is a 24V direct-current power supply switch, the calibration/detection switch 17 is a 24V direct-current power supply switch, and each electromagnetic valve detection selection switch 14 is a 24V direct-current power supply point-type button switch. The detection control panel 1 further comprises a power indicator light interface 18, the system power interface 9 is connected to the internal power indicator light interface 18, the power indicator light interface 18 is connected with a power indicator light 19, and the power indicator light 19 is used for displaying whether the system power 15 is connected to the system power interface 9.
The detection device also comprises an AC/DC module 20, a DC/DC module 21, a CPU22, an AD sampling module 23, a constant current source 24, a standard resistor 25, an optical coupler 26 and a decoupling diode group 27, wherein the standard resistor 25 is a precise power resistor, the decoupling diode group 27 is formed by connecting 4 diodes in parallel in a pairwise reverse direction, and the decoupling diode group 27 and diodes connected in parallel on the electromagnetic valve detection selection switches 14, the work/detection change-over switch 16, the calibration/detection change-over switch 17 and the work/detection universal switch 12 are all rectifier diodes with a follow current function. The AC/DC module 20 is connected to the system power interface 9, and is configured to convert AC power provided by the system power supply 15 into DC power, the AC/DC module 20 provides power to the constant current source 24 and the DC/DC module 21 through the normally open contact of the operation/detection switch 16, the DC/DC module 21 provides power to the CPU22, and the constant current source 24 provides standard current to the standard resistor 25.
The common contact of the calibration/detection change-over switch 17 is connected to the input interface of the AD sampling module 23, the normally closed contact of the calibration/detection change-over switch 17 is connected to two ends of the standard resistor 25, the normally open contact of the calibration/detection change-over switch 17 is connected to the common contact of the working/detection universal switch 12, the normally closed contact of the working/detection universal switch 12 is connected to the decoupling secondary tube group, the normally open contact of the working/detection universal switch 12 is connected to the normally open contacts of the plurality of electromagnetic valve detection selection switches 14, the plurality of electromagnetic valve power supply selection interfaces 4 are respectively connected to the normally closed contacts of the plurality of electromagnetic valve detection selection switches 14, and the common contact of the plurality of electromagnetic valve detection selection switches 14 is respectively connected to the corresponding plurality of electromagnetic valve electromagnetic drive interfaces 5.
Coil control signals of a plurality of solenoid valve detection selection switches 14 are connected to a plurality of corresponding solenoid valve detection selection interfaces 6, coil control signals of a calibration/detection changeover switch 17 are connected to a calibration/detection changeover interface 8, coil control signals of an operation/detection changeover switch 16 are connected to an operation/detection changeover slit, the solenoid valve detection selection interface 6, the calibration/detection changeover interface 8, the operation/detection changeover slit are connected to a CPU22, and coil control signals of an operation/detection changeover switch 12 are connected to a CPU 22.
The invention also discloses an electromagnetic valve detection method based on electromagnetic drive validity detection, which comprises the following steps:
s1: powering on the detection device to enable the detection device to be in a working state;
s2: calibrating the detection device to ensure that the detection device meets the detection requirement;
s3: and detecting the electromagnetic valves one by using a detection device, and judging the electromagnetic driving effectiveness of the electromagnetic valves.
In some specific embodiments, step S1 is to switch the operation/detection switch 16 to the detection state, connect the detection control board 1 to the system power supply 15, and initialize the detection control board 1, where the operation/detection switch 16 is in the pull-in state, and the plurality of solenoid valve detection selection switches 14, the calibration/detection switch 17, and the operation/detection switch 12 are all in the release state.
Step S2 specifically includes:
s2.1, calculating a designed theoretical voltage signal according to a constant current value set by the constant current source 24 and the resistance value of the standard resistor 25:
VS＝IH×R
in the formula: vSTo design a theoretical voltage, IHA constant current value set for the constant current source 24, R being a resistance value of the standard resistor 25;
S2.3, calculating the calibration accuracy rate eta,
and displays the calibration result on the display module 10;
and S2.4, judging whether the calibration accuracy rate eta meets the test requirement, and under the general condition, when the eta is greater than or equal to 95%, considering that the system normally operates and can carry out detection test, otherwise, the system error cannot meet the test requirement, and resetting the sampling system until the calibration accuracy rate eta can meet the test requirement. The test results are displayed through a 12864 liquid crystal display screen and comprise theoretical values, sampling data and result evaluation.
Step S3 specifically includes:
s3.1, the calibration/detection switch 17 is switched to a detection state, at the moment, the calibration/detection switch is in an attraction state, the constant current source 24 is loaded on a sampling signal line and connected to the common end of the contact of the work/detection switch 16, and the sampling signal is connected to the common contact of the work/detection universal switch 12 through the calibration/detection switch 17;
s3.2, one of the 4 electromagnetic valve detection selection switches 14 is pressed, and each electromagnetic valve detection selection switch 14 is a 24V direct-current power supply point-action type button switch, so that the condition that the electromagnetic valve corresponding to the electromagnetic valve detection selection switch 14 to be detected is equal to that of pressing one electromagnetic valve detection selection switch 14 can be ensured, and the condition that one electromagnetic valve is detected every time is ensured. After the electromagnetic valve detection selection switch 14 is pressed, the CPU22 sends out a control signal, the optical coupler 26 drives the work/detection universal switch 12 to suck, and the sampling channel is opened, so that the sampling channel is connected to the normally closed contact of the pressed electromagnetic valve detection selection switch 14;
s3.3, because the detection object is an electromagnetic driving coil and has an inductive property, the detection engineering is divided into three stages, namely a charging stage, a holding stage and a discharging stage according to the step response characteristic of the inductor.
(1) A charging stage: the charging phase can be equivalent to the step response of a first-order RL circuit, and the calculation formula is as follows:
when t is>At the time of 0, the number of the first,
(iL(0+)＝iL(0-) 0) is solved by a first order differential equation, the step response function of the inductor current can be found as:
the step response function of the inductor voltage is:
let us assume that iL(t) increasing from 0 to 90% of the final design value as the charging phase, using IHRepresents the current supplied by the constant current source 24, then
Namely, it is
From the above, it can be concluded that the charging phase has a time of
(2) A maintaining stage: detecting in a holding stage, wherein in the holding stage, an inductance effect disappears, only a resistance effect of the coil is reserved, and the resistance effect of the coil corresponds to an actual equivalent resistance value of the coil;
(3) and (3) a discharging stage: the discharging stage is the releasing process of the energy stored in the coil in the maintaining stage, and the equation of the releasing process can be obtained according to the formula (6)
In the formula uiTo release the initial voltage, u0To release the final voltage, we consider that the release process is complete when the voltage is released by 90%, and then u0＝uiX 10%, the release time is given by:
therefore, the charging stage and the discharging stage have certain duration, the voltage values acquired by the AD sampling module 23 in the charging stage and the discharging stage change continuously, the charging stage and the discharging stage need to be avoided during detection, and the monitoring data can be accurately obtained only by detecting in the maintaining stage. In the holding stage, the inductance effect disappears, only the resistance effect of the coil is kept, and the resistance effect of the coil corresponds to the actual equivalent resistance value of the coil;
s3.4, according to the inherent resistance of the coil and the constant current value set by the constant current source 24, a designed theoretical voltage signal can be calculated according to the step S2.1; the AD sampling module 23 collects the actual voltage signal VY(ii) a The effective rate eta of the electromagnetic drive is calculated,
and the calculation result is displayed on the display module 10, when eta is not less than a certain set value, the set value is generally set to 95%, and the user recognizes that eta is not less than the set valueWhen eta is smaller than a set value, the coil parameter of the corresponding electromagnetic driving device is considered to have larger difference with the design value or the corresponding electromagnetic driving device has a fault;
s3.5, according to the steps from S3.2 to S3.4, one of the electromagnetic valve detection selection switches 14 is pressed one by one, corresponding electromagnetic valves are selected to be detected respectively, and calculation results are displayed on the display module 10;
and S3.6, after all the electromagnetic valves are detected, switching the working/universal switch to a working state, and switching the working/detection switch 16 to the working state to complete the detection of all the electromagnetic valves.
The electromagnetic valve detection device and the detection method based on electromagnetic drive validity detection solve the cut-in from the volt-ampere characteristic and the step equation based on the inherent electrical characteristic of the electromagnetic coil, solve the basic principle of electromagnetic valve detection, provide a detection means for the electromagnetic valve validity detection, ensure the normal production working state and have strong practicability in the technical field of electromagnetic valve detection.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
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